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trace/hwlat: Do not wipe the contents of per-cpu thread data
author
Tero Kristo
<tero.kristo@linux.intel.com>
Fri, 10 Mar 2023 10:04:50 +0000
(12:04 +0200)
committer
Steven Rostedt (Google)
<rostedt@goodmis.org>
Sun, 19 Mar 2023 16:20:48 +0000
(12:20 -0400)
Do not wipe the contents of the per-cpu kthread data when starting the
tracer, as this will completely forget about already running instances
and can later start new additional per-cpu threads.
Link:
https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@linux.intel.com/
Link:
https://lkml.kernel.org/r/20230310100451.3948583-2-tero.kristo@linux.intel.com
Cc: stable@vger.kernel.org
Fixes:
f46b16520a087
("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
kernel/trace/trace_hwlat.c
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diff --git
a/kernel/trace/trace_hwlat.c
b/kernel/trace/trace_hwlat.c
index
d440ddd
..
edc26dc
100644
(file)
--- a/
kernel/trace/trace_hwlat.c
+++ b/
kernel/trace/trace_hwlat.c
@@
-584,9
+584,6
@@
static int start_per_cpu_kthreads(struct trace_array *tr)
*/
cpumask_and(current_mask, cpu_online_mask, tr->tracing_cpumask);
- for_each_online_cpu(cpu)
- per_cpu(hwlat_per_cpu_data, cpu).kthread = NULL;
-
for_each_cpu(cpu, current_mask) {
retval = start_cpu_kthread(cpu);
if (retval)